Spray gun nozzle



-Aug. 16, 1938. A. F. JENKINS SPRAY GUN NOZZLE 2 Sheets-Sheet 1 FiledHay 2,6, 1936 Aug. 16, 1938. A. F. JENKINS SPRAY GUN NOZZLE Filed May26, 1936 2 Sheets-Sheet 2 E MM@ gmc/whom Patented Aug. 16, 1938 UNITEDSTATES PATENT OFFICElv SPRAY GUN NOZZLE .Alexander F. Jenkins,Baltimore, Md.

Application May 26,

18 Claims.

This invention relates to spraying devices and has for its generalobject the provision of improvements in the nozzles of such deviceswhereby better atomization and distribution of the liquid materialemployed may be attained.

In a spray gun of the type now generally employed for applying paint,enamel or other liquid coating material to surfaces for the purposes ofprotection, ornamentation, or the like, the liquid material is aspiratedthrough a valve controlled orice disposed centrally of the forward faceof the nozzle of the gun, by means of an annular jet of air underpressure; and if a relatively flat or fan-shaped spray is required,convergent supplemental jets of compressed air are directed throughlaterally disposed orifices in the nozzle so as to impinge upon thecentral jet of aspirated liquid and convert this substantiallycylindrical or conical jet into one having an oval or even anapproximately rectangular cross sectional conguration. l

Heretofore the spray modifying jets have been in the form of solid conesemitted from fine circular orices formed very accurately in the sideportion of the nozzle so that the jets will impinge exactly uponopposite sides of the axis of the liquid jet. The liquid coatingmaterial is frequently also supplied to the vgun under some degree ofpressure and valves for regulating the pressures and quantities of theliquid and of both the aspirating and spray modifying air supplies aregenerally provided on the guns.

The degree of atomization required, the nature- 'and viscosity of theliquid to be sprayed, and the desired shape of the spray,-all of thesefactors determine the degree of adjustment necessary for theseregulating devices; and in most cases the relative pressures are quitecritical and must be very accurately controlled.

In the use of spray guns of the usual type in which solid supplementaljets of spray modifying air are employed, there is a tendency to 1.cause a split in the spray, that is, a narrowing of the cross section ofthe center of the spray and a lessening of the density of the spray atthis point and an increase in density at the end portions thereof due tothe unequal atomization of the sprayed liquid. To correct thiscondition, 'the usual practice, in constructions which permit it, is toreduce the supply of air to the supplemental jets. This adjustment,however, reduces the width of the spray and is apt to alter thecharacter of the spray in other ways, especially when made in connectionwith the use of highly viscous and difiicultly atomizable 193s. serialNo. 81,95?.

(Cl. zml-140.1)

materials such as synthetic enamels and the like.

I have found that by the provision of tubular or hollow conical spraymodifying jets of air, either alone or in conjunction with solid jets, abetter atomization and distribution of the liquid material may beattained and the splitting eliminated, while at the same time there maybe employed higher pressures or greater volumes of modifying air; andthis comprises an important feature of the present invention. Thisimprovement also aifords wetter and more uniform coatings and widerspray patterns, and permits the more effective atomization of heaviercoating materials, such as the synthetic enamels to which reference hasbeen made, which are more didicult to break up or atomize than theordinary paints or lacquers.

It has also been found that the pressures and volumes of air may bevaried within rather wide limits. without necessitating the fineadjustment of the supplemental spray modifying air supply which hasalways been necessary in the case of the use of solid jets.

The hollow supplemental air jets are produced in the preferredembodiments of my invention by the provision of -one or more annularorifices in the side portions of the spray gun nozzle or by the use ofannular orices together with a concentric circular orifice. Several waysof forming these orifices are disclosed herein, but the invention is ofcourse not limited thereto but comprises all variations or modificationswhich may fall within the scope of the subjoined claims.

Another advantage accruing from the use of a hollow tubular or conicalair jet resides in the fact that such extreme accuracy in machining theorifices to produce this type of jet is not necessary as in the case ofthe circular orifices employed for the projection of the solid jets.

Another readily appreciable eil'ect of this novel feature is the uniformatomization of the material at the extreme ends of the generallyelliptical spray patterns produced.

Another feature of my invention which may be applied to the spray gunnozzle, either alone or in conjunction with the annular supplemental jetorifices, is the provision of a central aspirating air orifice with aserrated marginal periphery. This construction is particularly effectivewhen employed in connection with the annular side jets, since both ofthese features cooperate to produce an advantageous softening anddiffusing effect on the spray.

A further feature which is especially useful in connection with thesomewhat numerous modications in the form of the air jets, is theprovision of a novel type of nozzle air cap. This air cap is made up oftwo parts, one preferably being threaded for application to the bodyportion of the spray gun and of standard construction, size andproportions; and the other part being secured to the rst named part andbeing of variable construction embodying any one of the different formsof aspirating or supplemental air jet orifices described.

Other objects and features of novelty will be apparent from thefollowing specification when taken in connection with the accompanyingdrawings in which several embodiments of my invention are illustrated byway of example.

In the drawings:

Figure 1 is a vertical longitudinal sectional view through the forwardbody portion and nozzle of a spray gun embodying the principles of myinvention;

Figure 2 is a view in side elevation of the air cap forming part of thenozzle;

Figures 3, 4, 6, g-'l and 8 are fragmentary vertical longitudinalsectional-views throughportions of the nozzles of spray guns showingother ernbodiments of my invention; l

Figure 5 is a fragmentary plan yiew of the /face of one of the horns ofthe gudshown in Figure 4;

Figure 9 is a similar fragmentary view of the same portion of theembodiment illustrated in Figure 8;

Figure 10 is a view in front elevation and Figure 11 is a fragmentaryfront View showing respectively two alternative forms` of central oricesadapted to cooperate with any of the modifications of the supplementaljets shown; and

Figure 12 is a chart showing diagrams of the spray patterns producedupon a surface by the designated types of nozzle.

Referring more particularly to Figure 1 of the drawings the numeral I0designates the forward body portion of the spray gun which may be of anydesired construction so far as the actuating and controlling mechanismis concerned. For example, it may follow, except as indicated otherwiseherein, the construction of the spray gun illustrated in my Patent No.2,082,061, dated June 1, 1937, filed January 12, 1935. The forward bodyportion I0 is provided with an internally threaded boss II which isadapted to receive the usual flexible connections by which Comunicationis established with a source of supply of liquid coating material, withwhich the passageway I2 communicates. A recess I4 is provided in theforward face I5 of the body portion I0 of the gun and is connected withthe passageway I2 by means of the bore I6. Threaded as at I8 within therecess I4 is the liquid nozzle 20 which is provided with an axial bore22 tapered as at 23 adjacent its forward end and narrowed at the extremeforward end to provide the relatively small central liquid port 24. Aneedle valve 25 is disposed within the bore 22 and is provided with atapered and attenuated forward end 26 which serves to regulate the port24. The needle valve 25 is extended rearwardly through the bore 28formed in thebody portion I0 of the gun and projects through thestuffing box arrangement 29 and is extended rearwardly to be connectedto the regulating and actuating mechanism not shown.

In this illustrative embodiment a common air passageway 30 is providedin the body portion I0 of the gun which is provided rearwardly of theillustrated portion with suitable actuating and controlling mechanisms.At the forward end of the gun the passageway 30 diverges to provide twoshort passageways leading to the front face I5 of the gun. Thesepassageways are designated by the numerals 32 and 33, the formerproviding means for supplying the air to the laterally disposed spraymodifying jets and the latter supplying the air to the centralaspirating jets of the nozzle. The mouth of the passageway 32 forms avalve seat 34 which is controlled by the needle valve 35 having therearwardly extending stem 36 and adapted to be controlled by mechanismcarried by the rearward body portion of the gun and not illustrated inthe present disclosure.

The liquid nozzle member 20 is provided with an enlarged taperedfrusto-conical portion 38 at the base of which there is `formed apreferably hexagonal nut portion 39 by which this member may be threadedinto the body portion of the gun. The outer peripheral portion of theconical liquid nozzle is provided with a circular series of smallpassageways 40 which communicate with the annular recess 42 formedbetween an outer enlargement of the recess I4 and the stem of the liquidnozzle. The air passageway 33 communicates with this annular chamber 42and the connection is sealed by means of the small gasket 43 which isadapted to be compressed between the rear face of the enlarged portion38 of the liquid nozzle and the face I5 of the spray gun.

A two-part outer nozzle cap 45is provided,which for purposes ofdescription in connection with its functions and relation to the otherelements of the gun, may be considered unitary. This cap has aninternally tapered portion 46 seating upon the conical outer surface ofthe enlarged portion 38 of the liquid nozzle. An annular flange orshoulder 48 is provided on the cap around which is fitted a clampingcollar 49 which is threaded as at 50 around the forward body portion ofthe gun. Centrally of the forward portion of the nozzle cap 45 anopening is formed through which the narrowed projecting end 53 of theliquid nozzle extends. The end of the liquid nozzle fits the openingwith ample clearance to form an annular orifice 52. Between the forwardportion of the cap 45 and the liquid nozzle there is formed an airchamber 54 which provides communication between the circular series ofpassageways 40 and the annular aspirating air orifice 52. Certain novelfeatures of the present invention which involve the shape of the annularorice 52 will be described hereinafter.

Upon diametrically opposite sides of the nozzle cap 45 there may beformed the projecting bosses or horns having diverging faces 6I withinwhich are formed the orices through which are emitted the convergingjets of spray modifying air which impinge upon the central sprayprojected axially of the gun in order to flatten and control the shapeof the spray pattern. In all of the illustrated embodiments, each of thehorns 68 is provided with bores within which may be disposed devices foraltering the configuration of the spray modifying jets in accordancewith the various phases of the present invention. In the rst embodimentillustrated in Figure 1 the bore is designated and is provided with anarrowed forward portion 66. Each bore 65 is placed in communicationwith the air supply by means of the rear passageways 68 leading from theannular chamber I0 formed between the face I5 of the body portion of thegun, the liquid nozzle, the rear face of the air cap 45. and theclamping 'sleeve 49. This space or chamber 10 is pro-- vided with itsair supply by means of the passageway 32 controlled by the valve 35which has already been described.

In the embodiment illustrated in Figure 1, the bores 65 provided in thehorns 60 are continued through the rear inclined faces 13 of the hornsso as to provide means for the insertion of the plugs 14 which areprovided with the forwardly and inwardly projecting pins 15. These pins1l are of a smaller diameter than the forward portion 66 of the bores 65and thus provide annular passageways 16 forming oriiices through whichthe tubular or hollow conical blastsof air are directed toward thecentral axial spray. The plugs 14 are formed so as to iit tightly withinthe rear portion of the bore 65 when driven therein.

The improvement provided by means of the present invention in theaspirating and initially atomizing means for the liquid material willnow be described. Instead of the usual circular opening in the forwardface of the cap 45 surrounding the tip of the liquid nozzle thereisemployed in the present nozzle, either in connection with modifyingjets of the prevalent solid character or with any of the improvedmodifying jets provided in connection with the present invention, anorifice of irregular periphery. 'I'his feature involves providing kerfsor serrations in the periphery of the central opening of the vcap toprovide the annular port or oriilce 5-2 with a serrated margin. Theseserrations or kerfs are illustrated in two forms at and 80 as shownrespectively in Figures 10 and 1l of the drawings. The indentations 80are in the form of rectangular kerfs provided in the outer peripheralmargin of the orice and the indentatio'ns 80 are in the form oftriangular serrations providing a somewhat starshaped oriiice. By thismeans the margin of the aspirating jet of air is not so sharply definedbut is broken up to some extent for the purpose of securing betteratomization and a softening effect on the spray. 'I'his feature is ofsome utility even when employed alone or in connection with the oldsolid modifying air jets, but has been found to be of especialimportance in connection with the somewhat more diuse hollow tubular orconical modifying air jets provided in accordance with the presentinvention. v

In Figure 3 of the drawings there is illustrated an embodiment of myinvention wherein the conguration of the horns 60 and their bores 65 isthe same as in the case of the embodiment shown in Figure 1. However,the plug 14 is provided with a hollow pin or projection 15' with anaxial bore 82 provided therein. Ihe base of this bore 82 is placed incommunication with the bore 65 by means of one or more holes 04 formedin the hollow pin 15. By this means, compound jets of spray modifyingair may be projected toward --the axial liquid spray, each comprising aninner solid jet surrounded by an external tubular jet of air.

In Figures 4 and 5 of the drawings there is illustrated a modication inwhich the bore 65 is not extended through the rear face oi' the horn 60but the base of the bore is provided with a narrowed socket or recess 86within which a pin 88 is adapted to seat preferably with a driving t.The pin 88 is provided with a polygonal enlargement 89, being in theform of a triangle in the illustrated embodiment, which serves to centerthe pin Il with respect to the bore 65' to maintain the uniformity ofthe annular port or orifice 10.

In Figure 6 a somewhat similar arrangement is shown in which the pin 80'is seated within a socket or recess .86' and is centered by means of anannular flange 89- through which a series of holes 90 are formed for thepassage of air to provide the tubular jet issued from the annularorificek 16.

In Figure '1 a removable pin 15 is employed which is provided upon itsrear end with a threaded enlargement 92 adapted to vbe secured withinthe threaded recess 93 formed in the rear surface of the horn 60, andalso a kerfed head 95 for the application of a tool whereby the pin 15may be removed and replaced.

In Figures 8 and 9 of the drawings there is illustrated a still furthermodication in which a plurality oi annular openings are provided throughwhich may be discharged concentric tubular blasts of air. The plug 14 inthis embodiment is provided with a forwardly projecting pin 15 and alsoa tubular sleeve 96 is threaded into the plug 14' as at 91. Thisarrangement provides two annular orifices16 and 16. Communication isprovided between the inner and outer bores in this embodiment by meansof one or more openings 98 formed in the tubular member 06.

For the purposes of convenience and economy in the quantity productionof these nozzles they may be formed in two parts as clearly shown in thesectional views in the drawings and also as will be pointed out inconnection with Figures 2 and 10. This feature also'ifacilitates theapplication of the attaching collar 49 tol the air cap. The rearwardportion of the cap 45 to which the collar 49 is applied is of agenerally annular configuration and is designated by the referencecharacter |00. This portion may be of standardized construction anddimensions regardless of the type of vorifices used. The forward portionof the cap hasa narrow rectangular outline when viewed from the front,and is adapted to carry the iiuid projecting portions of the nozzlewhich may be of any of the types shown and described herein.

As best seen in Figure 2 of the drawings the conical forward face |02 ofthe portion |00 is provided with jthe central transverse slot or groove|03`within which the portion |0| is disposed. Each end of the latterportion is provided with overhanging shoulders |04v by which itstransverse position is determined, so as to provide proper registry forthe several portions of the passageways 60 and the chamber 54 which areintersected by the dividing surfaces denoted by the line |05, betweenthe two cap portions |00 and |0|.

Any suitable means may be employed for securing these two portionstogether; one of these means being by soldering them at the pointsindicated by the reference character S. By making the cap in two parts,the ready substitution of one type of orifice for another may beattained and the assembling of the air cap 45 and its retaining ring 49is made easier. On account of the projecting horns 60, in the air cap ofthe ordinary type, the flange of the retaining ring must be spun overthe shoulder 48 of the air cap. This necessity is of course eliminatedin the present case, the forward orificed member of the air cap beingapplied and secured in position after the ring is in place.

In Figure 12 there is shown a chart wherein there are graphicallyillustrated the types of spray patterns produced by devices constructedin accordance with the present invention as compared with thoseemploying solid modifying jets. In the diagram designated I in thechart, there is represented a spray pattern produced by a gun of thetype described in the present invention in which annular spray modifyingjets are employed. In producing this pattern the air pressure wasadjusted to 75 lbs. and the pressure upon the liquid coating materialwas 3 lbs. The .air valves of the gun including the valve designated 35in Figure 1 of the drawings were opened to their widest extent and itwill be noted that the spray pattern is represented by an elongated ovalarea in which the atomization was uniform substantially throughout.

The pattern designated II was made by a spray gun of comparablespecifications, except that solid modifying air jets were employed. Theair pressure and the liquid pressure were the same as that employed inconnection with the production of the pattern designated I and all airvalves were opened wide. It will be noted that the pattern is narrowedat its central portion and the spray is heavier at the side portions ofthe pattern than at the center, the tendency toward splitting" beingvery apparent.

In an effort to correct this tendency, the usual practice is to cut downthe pressure and volume of air supplied to the supplemental spraymodifying jets by regulating the valve 35. Such an eiiect is illustratedin pattern No. III. Here, it will be noted, the spray pattern is againof a fairly uniform atomization but has been narrowed to a very greatdegree, this, of course, reducing the coverage and increasing the laborrequired to apply the coating.

In the pattern designated IV, 100 lbs. of air and liquid coatingmaterial under 4 lbs. pressure were applied to a spray gun employingsolid supplemental air jets, and the tendency toward splitting is quiteextreme in this case.

On the other hand, the pattern shown in diagram V illustrates the resultof employing the same pressure conditions as in the case of pattern IVin a gun constructed in accordance with the present invention in whichannular supplemental jets are provided. It Will be noted that there islittle or no tendency toward splitting and the atomization is veryuniform and the width of the spray pattern is not reduced.

Although several variant forms of my invention have been illustrated anddescribed, it is conceivable that further modifications may be madetherein and, within the scope of the claims, such variations are to beconsidered as coming within the purview of the invention. It is furtherunderstood that the proportions or relative sizes of the variouselements and orifices are not limited to those illustrated but may bevaried within Wide limits.

Having thus described the invention, what is claimed as new and desiredto be secured by Letters Patent is:

l. In a spraying device of the class described, a nozzle comprising, incombination, means centrally thereof for discharging a liquid spray, andmeans disposed at one side of said first named means for discharging atubular jet of air against said spray to modify its cross sectionalconfiguration.

2. In a spraying device of the class described,

a nozzle having centrally disposed concentric liquid and compressed airorifices for the discharge of a spray of atomized liquid material, saidnozzle also having a supplemental annular orifice formed thereinlaterally of said first named orifices for the discharge of a hollow jetof spray modifying air.

In a spraying device of the class described, a nozzle comprising, incombination, means provided axially thereof for discharging an atomizedliquid spray, said nozzle also having an annular orifice formed thereinupon each side of said axially disposed means and directed so as todischarge hollow substantially tubular jets of air -to impinge uponopposite sides of said spray at a point spaced from the face of thenozzle, in order toy modify the cross sectional configuration of thespray.

4. In a spraying device of the class described, a nozzle comprising, incombination, means provided axially thereof for discharging an atomizedliquid spray, said nozzle also having a plurality of concentric orificesformed therein upon each side of said axially disposed means anddirected so as to discharge concentric substantially tubuular jets ofair to impingeupon opposite sides of said spray at a point spaced fromthe face of the nozzle, in order to modify the cross sectionalconfiguration of the spray.

5. In a spraying device of the class described, a nozzle comprising, incombination, means provided axially thereof for discharging an atc'nizedliquid spray, said nozzle also having a plurality of concentric annularorifices formed therein upon each side of said axially disposed meansand directed so as to discharge concentric substantially tubular jets ofair to impinge upon opposite sides of said spray at a point spaced fromthe face of the nozzle, in order to modify the cross sectionalconfiguration of the spray.

6. In a spraying device of the class described, a nozzle comprising, incombination, means provided axially thereof for discharging an atomizedliquid spray, said nozzle also having a plurality of concentric circularand annular orifices formed therein upon each side of said axiallydisposed means and directed so as to discharge concentric substantiallytubular jets of air to impinge upon opposite sides of said spray at apoint spaced from the face of the nozzle, in order to modify the crosssectional configuration of the spray.

7. In a spraying device of the class described, a nozzle havingcentrally disposed concentric liquid and compressed air orifices for thedischarge of a spray of atomized liquid material, certain of saidorifices having a serrated margin for affecting the configuration,degree of atomization, and velocity of the marginal portions of thespray, said nozzle also having supplemental annular orifices formedtherein laterally of said first named orifices for discharging hollowtubular jets of air against said spray to further affect the atomizationand cross sectional configuration of said spray.

8. In a spraying device of the class described, a nozzle havingcentrally disposed concentric liquid and compressedair orifices for thedischarge of a spray of atomized liquid material, the outer margin ofthe air orifice being provided with a multiplicity of serrations foraffecting degree of atomization and the velocity of the marginalportions of the spray, there being a suflicient number of such serratonsthat the margin of said spray is roughened without altering the generalcircular configuration thereof.

9. In a spraying device of the class described, a

nozzle having a central liquid orice, a substantially annular aspiratingair orice concentric with said liquid orice, and laterally positionedsupplemental air orifices directed so as to discharge converging spraymodifying jets of air toward the prolonged axis of said first namedorifices, the margin of said aspirating air orioe being provided with aplurality of kerfs at intervals of less than 90 around is periphery,there being a suicient number of suchiserrations that the margin of saidspray is roughened without altering the general circular configurationthereof.

10. In a spraying device of the class described, a nozzle having acentral -liquid orifice, a substantially annular aspirating air oriiceconcentric with said liquid orice, and laterally positioned supplementalair orifices directed so as to discharge converging spray modifying jetsof air toward the prolonged axis of said ilrst named orices, the marginof said aspirating air orice being provided with a multiplicity ofsubstantially rectangular kerfs at short intervals around its periphery,there being a sufcient number of such serrations that the margin of saidspray is roughened without altering the general circular congurationthereof.

11. In a spraying device of the class described, a nozzle having acentral liquid orifice, a substantially annular aspirating air orificeconcentric with said liquid orice, and laterally positioned supplementalair orices directed so as to discharge converging spray modifying jetsof air toward the prolonged axis of said rst named orices, the margin ofsaid aspirating air orice being provided with a multiplicity ofsubstantially wedge shaped kerfs at frequent intervals around itsperiphery, there being a suillcient number of such serrations that themargin of said spray roughened without altering the general circularconguration thereof.

12. In a spraying device of the class described, a nozzle comprising, incombination, means disposed axially thereof for the projection of aspray of atomized liquid material, and means disposed upon said nozzleon each side of said axis for projecting tubular jets of spray modifyingair upon said axial spray, said last named means each comprising a borecommunicating with a source of compressed air, and a plug disposed insaid bore and having an elongated portion of somewhat smaller diameterthan that of said bore and spaced from the walls of the bore to providean annular passageway for the projection of the tubular jet. l

13. In a spraying device of the class described, a nozzle comprising, incombination, means disposed axially thereof for the projection of aspray of atomized liquid material, and means disposed upon said nozzleon each side of said axis for projecting tubular jets of spray modifyingair upon said axial spray, said last named means each comprising a. borecommunicating with a. source of compressed air, and a removable plugdisposed in said bore and having an elongated portion of somewhatsmaller diameter than that of said bore and spaced from the walls of thebore to provide an annular passageway for the projection of the tubularjet.

14. In a spraying device of the class described, a nozzle comprising, incombination, means disposed axially thereof for the projection `of aspray of atomized liquid material, and means disposed upon said nozzleon each side of said axis for projecting tubular jets of spray modifyingair upon said axial spray, said last named means each comprising a borecommunicating with a source of compressed air, and a removable plugthreaded into said bore and having an elongated portion of somewhatsmaller diameter than that of said bore and spaced from the walls of thebore to provide an annular passageway for the projection of the tubularjet.

l5. In a spraying device of the class described. a nozzle comprising, incombination, means disposed axially thereof for the projection of aspray of atomized liquid material, and means disposed upon said nozzleon each side of said axis for projecting tubular jets of spraymodifyingk air upon said axial spray, said last named means eachcomprising a recess communicating with a source of compressed air, a pinof somewhat smaller diameter than that of said recess disposed Withinsaid recess, and means for centering said pin with respect to saidrecess, whereby there is provided an annular orifice for the projectionof said tubular jet.

16. In a spraying device of the class described, a nozzle comprising, incombination, means disposed axially thereof for the projection of aspray of atomized liquid material, and means disposed upon said nozzleon` each side of said axis for projecting tubular jets of spraymodifying air upon said axial spray, said last named means eachcomprising a recess communicating with a source of compressed air, ahollow tubular pin lof somewhat smaller diameter than that of saidrecess disposed within said recess, means for centering said pin withrespect to said recess, and means for admitting a portion of said airsupply to the interior of said pin, whereby combined circular andannular orifices are provided for the projecting of said supplementaljets.

17. In a spraying device of the class described, a nozzle comprising, incombination, means disposed axially thereof for the projection of aspray of atomized liquid material, and means disposed upon said nozzleon each side of said axis for projecting tubular jets of spray modifyingair upon said axial spray, said last named means each comprising arecess communicating with a source of compressed air, a pin of somewhatsmaller diameter than that of said recess disposed within said recess, atubular member also disposed within said recess concentrically of saidpin and spaced from both said pin and the wall of the recess, and meansfor supplying the interior of said tubular member with compressed air,whereby double tubular jets of spray modifying air may be projected fromsaid nozzle.

18.A A nozzle for spray guns or the like comprising, in combination, asubstantially annular base member adapted to be applied to and tocooperate with the liquid nozzle and body portion of the gun, said basemember being provided with a transverse rectangular slot cut in itsforward face for the reception of a complementary jet portion,a membercomprising said jet portion and provided with a plurality of jetorifices and fitted'within said slot, passageways Within said last namedmember leading to said oriiice, passageways in said base memberproviding communication between said first named passageways and thebody of the gun.

ALEXANDER F. JENmNS.

